Backpacks >>
HKM-125331 Waterproof USB Charging Laptop Backpack with Large Capacity for Business Travel
HKM-125331
Waterproof USB Charging Laptop Backpack
A meticulously engineered travel companion that fuses sophisticated design with practical innovation—built for the modern professional who demands reliability, connectivity, and effortless organization in every journey.
Engineered for the way you work and travel
Every detail of the HKM-125331 has been refined to deliver a seamless experience—from weather protection to device charging, from intelligent organization to all-day wearing comfort.
Advanced Water-Resistant Protection
Constructed with high-density, water-repellent fabric that causes moisture to bead and roll off the surface. Your laptop, documents, and personal electronics stay safeguarded during unexpected rain showers, splashes, and humid conditions—without adding unnecessary bulk or weight to the backpack.
Integrated USB Charging Port
A built-in external USB interface lets you connect your power bank internally and charge your smartphone or tablet externally—no need to open the bag or fumble with tangled cables. Stay powered up while commuting, navigating airports, or moving between meetings. Compatible with most USB-A charging cables.
Generous Multi-Compartment Capacity
With an intelligently distributed interior volume of approximately 35 liters, the HKM-125331 accommodates a laptop up to 17.3 inches, plus dedicated spaces for tablets, notebooks, chargers, clothing layers, and daily essentials. The main compartment opens wide for effortless packing and quick retrieval.
Ergonomic Comfort for Extended Wear
Padded, contoured shoulder straps distribute weight evenly across your shoulders, while the breathable mesh back panel promotes airflow to reduce heat buildup. An adjustable sternum strap and reinforced top handle add carrying versatility. Designed to minimize fatigue during long commutes, conference days, and international travel.
Technical Specifications
Precision engineering reflected in every measurement and material choice.
External Dimensions
18.9 × 13.0 × 7.9 in (48 × 33 × 20 cm)
Net Weight
2.4 lbs (1.1 kg)
Total Capacity
35 L (approx. 2,136 cu in)
Laptop Compartment
Fits up to 17.3-inch laptops (44 cm diagonal)
USB Port Type
USB-A 2.0 female connector (5V / 2.1A output)
Primary Material
High-density polyester with water-repellent coating
Closure Type
Smooth dual-zipper system with metal pulls
Back Panel
3D breathable mesh with multi-layer foam padding
Built for every chapter of your professional life
From the morning commute to the boardroom, from the airport lounge to the co-working space—the HKM-125331 adapts effortlessly to your environment.
Daily Office Commute
Keep your laptop, charger, lunch, and a change of clothes neatly separated. The slim profile fits under desks and on crowded transit without bulk.
Business Travel
Slides over a rolling suitcase handle for easy airport navigation. The USB port keeps your phone alive through delays and long-haul flights.
Casual & Weekend Use
The sleek, understated design transitions naturally into non-business settings. Pack a jacket, tablet, and essentials for a coffee-shop work session or a weekend getaway.
Understanding Water-Resistant Backpack Technology
A closer look at the engineering behind weather protection in modern carry solutions.
Not all "water-resistant" backpacks are created equal. The effectiveness of water resistance depends on three key factors: fabric density, coating technology, and construction quality. The HKM-125331 addresses all three:
Fabric Density
Tighter weaves create smaller gaps between fibers, making it physically harder for water droplets to penetrate. The HKM-125331 uses a 600D+ polyester weave for optimal density.
DWR Coating
Durable Water Repellent treatment bonds at the molecular level, causing water to bead up and roll off. Unlike spray-on coatings, it resists degradation from friction and flexing.
Seam Construction
Double-stitched seams with reinforced binding prevent water ingress at the most vulnerable points—the stitch holes. Every seam on the HKM-125331 is inspected for consistency.
The HKM-125331 is classified as water-resistant, meaning it protects against rain, splashes, and brief exposure to moisture. It is not designed for full submersion. For the vast majority of urban and travel scenarios—caught in a downpour, splashed by a passing vehicle, or navigating a drizzly commute—it delivers reliable, worry-free protection.
Frequently Asked Questions
Quick answers to common inquiries about the HKM-125331.
How does the USB charging port work?
The backpack features an internal USB-A cable that connects to your own power bank (not included). Once connected, the external USB-A port on the side of the backpack becomes active. Simply plug your smartphone or tablet charging cable into the external port to draw power. This design keeps your power bank securely stored inside while providing convenient external access. The system supports standard 5V / 2.1A output, suitable for most mobile devices. A rubber flap covers the external port when not in use to prevent dust and moisture ingress.
Is the backpack fully waterproof or water-resistant?
The HKM-125331 is water-resistant, not fully waterproof. The high-density polyester fabric with DWR treatment effectively repels rain, splashes, and light moisture—water beads up and rolls off the surface. It handles typical urban and travel weather conditions with confidence. However, it is not designed for prolonged heavy downpours or submersion in water. For extreme conditions, we recommend using an additional rain cover. The term "Waterproof" in the product name reflects its excellent water-shedding capability in everyday use.
What size laptop can the backpack accommodate?
The dedicated padded laptop compartment fits devices up to 17.3 inches measured diagonally (approximately 44 cm). This covers most standard laptops, including 15.6-inch and 17-inch models from major manufacturers. The sleeve is lined with soft, scratch-resistant fabric and features an elastic Velcro retention strap to hold the laptop securely in place. There is also a separate tablet sleeve that accommodates devices up to 12.9 inches, such as the iPad Pro.
How comfortable is this backpack for extended wear?
Comfort was a top priority in the design of the HKM-125331. The shoulder straps are contoured and padded with multi-layer foam to reduce pressure points. The back panel uses a 3D breathable mesh system with ventilation channels that promote airflow and minimize heat buildup—particularly beneficial during warm-weather commutes or when carrying heavier loads. An adjustable sternum strap helps distribute weight evenly and stabilizes the backpack during movement. The total weight of just 2.4 lbs (1.1 kg) means the backpack itself does not add unnecessary burden before you even pack it.
What materials are used and how durable are they?
The primary material is high-density 600D+ polyester, widely regarded in the luggage and outdoor gear industries for its excellent balance of durability, lightweight properties, and resistance to tearing and abrasion. The fabric is treated with a durable water-repellent (DWR) finish at the manufacturing stage. Zippers are sourced from trusted hardware suppliers and feature metal pulls for longevity. Stress points such as strap attachments and handle bases are reinforced with bar-tack stitching. With reasonable care, the HKM-125331 is built to withstand years of daily use.
Can I use this backpack as a carry-on for air travel?
Yes. With external dimensions of 18.9 × 13.0 × 7.9 inches (48 × 33 × 20 cm), the HKM-125331 meets the carry-on size requirements of most major airlines, including those in North America, Europe, and Asia. It fits comfortably in overhead bins and under the seat in front of you. The rear luggage pass-through sleeve allows it to be secured over the handle of a rolling suitcase, making it an ideal companion for air travel. Always check your specific airline's latest carry-on policies before flying.
Purchase with Confidence
Every HKM-125331 is backed by comprehensive customer protections.
Free Shipping on All Orders
Complimentary standard shipping on every order, with no minimum purchase required. Delivered directly to your doorstep at no extra cost.
180-Day Purchase Protection
Extended protection covers manufacturing defects and material faults for a full 180 days from the date of purchase, giving you peace of mind well beyond the standard.
30-Day Money-Back Guarantee
Not completely satisfied? Return the backpack in its original condition within 30 days for a full refund. Hassle-free and straightforward.
24-Month Warranty Service
A full two-year warranty against defects in materials and workmanship. If anything goes wrong under normal use, we'll repair or replace your backpack at no charge.
Every product we offer includes a 180-day purchase protection plan at no additional cost. This coverage extends beyond a standard warranty, reflecting our confidence in product quality and our ongoing commitment to your satisfaction.
The protection plan is designed to provide practical help in real-world situations. Whether you encounter a manufacturing issue, a performance problem, or an unexpected accident, our team is ready to assist with clear, fair solutions.
What Is Covered
Manufacturing Defects
We replace items with material or workmanship flaws at no charge.
Performance Failures
Free repair or replacement if the product fails under normal use.
Accidental Damage
One-time courtesy replacement at a reduced price.
Zero Hidden Fees
All shipping costs for replacements and returns are covered.
How to File a Claim
How This Differs from the Warranty
The 180-day purchase protection includes accidental damage and performance failures that are typically not covered by a standard warranty. It provides an additional layer of support during the first six months after purchase, giving you greater confidence and peace of mind.
We want you to be completely satisfied with your purchase. If for any reason you are not fully happy, you may return your item within 30 days of delivery for a full refund. No lengthy forms, no unnecessary questions.
Our return policy is built on a simple principle: if the product is not right for you, we will make it right. We understand that online shopping involves trust, and we work hard to earn that trust with every order.
Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
Unworn or unused, with tags and original packaging.
Proof of Purchase
A receipt or order number is required.
Fast Refund
Refund processed within 10 business days.
How to Start a Return
Returns & Exchanges Overview
Damages & Exchanges
Please inspect your order as soon as it arrives. If the item is defective, damaged, or incorrect, contact us immediately so we can evaluate the issue and make it right. For exchanges, the fastest option is to return the original item and place a new order for the replacement.
We believe in the quality of our products, and we want you to share that confidence. Every product is backed by a 24-month warranty covering all structural and functional components, including zippers, buckles, straps, and fabric integrity.
The warranty is designed to be simple and accessible. You only need your proof of purchase to begin a claim, and our team will assess the issue promptly. If a manufacturing issue arises, we will make it right.
What the Warranty Covers
Comprehensive Coverage
Every part warranted for two full years.
Free Repair or Replacement
Whichever is faster, at no cost to you.
Quick Turnaround
Claims assessed within 1 business day.
Transferable
Warranty follows the product, not the owner.
How to File a Warranty Claim
Every order ships free—no minimums, no hidden fees. We currently deliver across the United States and are actively working to expand to more countries. We partner with reliable U.S. courier services to ensure your order arrives safely and on time.
Our delivery process is designed for transparency. From the moment you place your order to the moment it reaches your door, you receive clear updates at every stage. We carefully inspect each product before dispatch, and we provide tracking information as soon as your order ships.
Our U.S. Shipping Partners
USPS
Official national carrier with nationwide coverage.
UPS
Fast and reliable ground and express shipping.
FedEx
Express delivery with real-time tracking.
DHL eCommerce
Efficient parcel delivery for e-commerce shipments.
Delivery Process
Delivery Time Summary
Cancellations & Taxes
You may cancel your order at any time before it ships. All product prices include applicable taxes, and there are no additional VAT or customs fees for orders delivered within the United States.
Whether you have a question, need help with an order, or just want some advice, our support team is available around the clock. We don't just respond to messages—we work with you to find real solutions that fit your needs.
Our support specialists are trained to handle a wide range of requests, from product recommendations to technical troubleshooting. No matter the question, you can expect a professional and friendly response.
How We Can Help
Product Guidance
Our experts help you choose the right product.
Order Assistance
Modify orders, track shipments, or speed up delivery.
Warranty & Returns
Start claims or returns quickly and easily.
Technical Troubleshooting
Step-by-step solutions for product issues.
Contact Information
24/7 Phone
+1 (209) 280-3200
support@hekomart.com
Address
3401 Dale Rd, Modesto, CA 95356
Support Hours
Available 24 hours a day, 7 days a week
